Adjustable tool-holder



J. H. SMITH. ADJUSTABLE TOOL HOLDER.

APPLICATION FILED MAY 2. I919- Patented May 17,1921.

1 \lul W 1.1 W M 1| UNITE stares -raar .orrice.

JOHN E. SMITH, OF DETROIT, MICHIGAN, ASSIGNOR TO THE ECLIPSEINTERCHANGE- ABLE COUNTERBORE COMPANY, OF DETROIT, MICHIGAN, ACORPORATION OF- MICHIGAN.

ADJUSTABLE TOOL-HOLDER.

, Specification of Letters Patent. Pate te'd M 1921 Application fiIedMay2, 1919. Serial No. 294,309.' I

To all whom it may concern.

Be it known that I, JOHN H.v SMrrH, a citizen of the United States ofAmerica, residin at Detroit, in the county of Wayne and State ofMichigan, have invented certain new and useful Improvements in Adustable Tool-Holders, of which the IOlIOWHIg lS a specification,reference being had therein to the accompanying drawings. I

The invention relates to adjustable drill holders and has a specialapplication to multiple drill machines. l

t is the object of the nvention to provide a mounting for a rotatingtool a-nd more particularly for a drilling or counterboring tool thatwill permit a quick longitudinal adjustment of the tool in a holdertherefor for the purpose of establish ng the point or face of the toolin any desired relation to the work and to provide for positivelyholding the tool in any position of such ad ustment.

A further object of the invention is to provide an adjustable mountingfor drilling or counterboring tools,applicable for use in a multipledrill machine to permit aquick adjustment for bringing all of the cuttng points to a common level or to such vary ng levels as the nature ofthe workmay require.

In the accompanying drawings:

Figure l is a side elevational view of the invention;

Fig. 2 is an axial sectional view of the same; n

Fig. 3 is I an axial sectional view OI an alternative form of theinvention.

In these views, the reference character 1 designates a holder having theusual tapering shank 1, whereby it may 40 be engaged with the chuckof amachine. Said holder has a socket opening in an end thereof havingbearing portions 2 and 2 of different diameters and the intermediatethreaded portion 3. Said socket is adapted to'receive a collet havingthe threaded portion 5 engageable with the socket threads 8 and havingat each side of the portion 5 the portions 4' and 4: for respectivelyengag ng the bearings 2 and 2. Below the portion 4, said collet isformed with the threaded portion 6 which is pitched reversely to theportion 5. Below the portion 6, the collet is formed with a head 6*,with which a suitable tool,

as, for example, the drill 7, may be engaged in any desired manner- 8 isa lock-nut engaging the screw-threads 6 and bearing: 1

against the lower end of the member 1 to hold the collet rigid with theholder.

To'eiiect a longitudinal axial adjustment of the tool 7 it is necessarymerely to loosen the lock nut 8, then rotate the collet to shift thesame up or down as desired, and finally to again clamp the lock nutagainst the lower end of the holder. The simplicity of the ad ustingmeans is such that it requires only a few moments to perform theoperation just described. The screw-threads are so pitched that theresistance to rotation offered by thecollet,due to engagement of thetool with the work, will tend to increasingly bind the lock-nut againstthe lower end of the holder member.

In that form of the invention shown i Fig. 3, the collet has threadedengagement at its upper end with the holder 1, said end being somewhatreduced, as indicated at 9, the portion 10 intermediate said part andthe reversely threaded lower portion 11'being unthreaded and slidablyengaging the socket.

What I claim as my invention is: v

1. The combination with a socketmember having its socket formed withcylindrical bearing portionsof difierent diameters and. an intermediatethreaded portion, of a collet insertible in the socket member and havingportions slidably engageable with the hearing portion of the socket, andan intermediate threaded portion engageable with the threads of thesocket, and means for lockmg said collet in various positions oflongitudinal adjustment.

2. The combination with a socket member formed with cylindrical bearingportions of different diameters, and an intermediate threaded portion ofa collet insertible in said socket member having portions slidably.engageable with said bearing portions of the socket member, anintermediate threads ed portion for engaging said threads of the socket,and a reversely threaded portion projecting exteriorly of'the socket,and a locknut engaging said reversely threaded portion and adjustablethereon to bind against the socket member.

In testimony whereof I afiix my signature.

JOHN H. SMITH.

